# Senior Software Engineer

**Company:** [Underdog Fantasy](https://hotfix.jobs/companies/underdog-fantasy)
**Location:** Remote
**Role:** Mobile Engineering
**Salary:** $150k – $220k/yr
**Experience:** 7+ years
**Skills:** React Native, iOS, Android, Ruby, mobile performance, Datadog, Amplitude
**Posted:** 2026-07-31

> Senior Software Engineer specializing in React Native to build and scale Underdog's core betting experience across mobile and web, from slip creation to settlement. Requires 7+ years experience, cross-platform problem solving, and leadership in design and coaching.

## Job Description

## Responsibilities
- Build and scale core parts of the mobile and web apps in React Native, including entry building, review, placement, and tracking throughout the whole lifecycle.
- Investigate and resolve critical issues in the React Native client, and implement guardrails to prevent recurrence.
- Lead design reviews for initiatives spanning iOS, Android, and React Native clients, highlighting trade-offs, risks, and failure modes.
- Partner with backend, product, and design teams on entry placement, confirmation, slip changes, errors, and bet history to ensure a fast and consistent experience.
- Turn ambiguous, cross-team goals into concrete plans with milestones and clear owners.
- Use data from product analytics, error dashboards, and session replays to validate fixes and catch regressions early.
- Coach other engineers on design reasoning and ownership; create reusable patterns that other teams adopt.
- Anticipate and mitigate risks in shared systems before they impact other teams or customers.

## Requirements
- 7+ years of professional software engineering experience, with significant time in React Native and a solid understanding of the native iOS/Android layers.
- Track record of solving cross-cutting or ambiguous problems spanning multiple services, teams, or platforms.
- Experience leading technical initiatives (e.g., performance, reliability, developer velocity) with measurable impact.
- Comfort translating high-level goals into executable plans with milestones that gain team alignment.
- Collaborative coaching mindset that improves other engineers through reviews and discussions.
- Strong written and verbal communication skills, able to explain technical trade-offs to product, design, and engineering teams.
- Experience with mobile app performance, testability, and shipping reliable features at scale.

## Nice-to-Haves
- Background in sports, fantasy, or gaming.
- Experience working on wagering, betting, or high-stakes transactional flows.
- Familiarity with Amplitude, Datadog, or similar tools for client-side monitoring.

## Compensation and Benefits
- Target base salary: $150,000 - $220,000 plus equity.
- Unlimited PTO (flexible except first few weeks before and during NFL season).
- 16 weeks fully paid parental leave.
- Home office stipend.
- 5% 401k match, FSA, company-paid health, dental, vision plans.
- Remote-first with 2-3 annual in-person offsites.

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